#sea_ladder__sealadder__sea_steps__seastep  (nautical) ladder to be lowered over a ship's side for coming aboard
  supertype:  #ladder  steps consisting of two parallel members connected by rungs; for climbing up or down
  subtype:  #accommodation_ladder__accommodationladder  (nautical) a portable ladder hung over the side of a vessel to give access to small boats alongside

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